Hot-air furnace



July '31, 192&

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G. HATVANI HOT AIR FURNACE Filed July 8, 1926 6 Sheets-Sheet 6 Gabrz'eZ 1526612 11 Patented July 31, 1928.

UNITED STATES PATENT OFFICE,

GABRIEL HATVAN I, OF MEDINA, OHIO.

HOT-AIR FURNACE.

Application filed July 8,

This invention relates to certain new and useful improvements in hot air furnaces, and the primary object of the invention is to provide a furnace of this kind which is extremely simple and durable in construction as well as efficient in use.

A further object is to provide a hot air furnace which may be cheaply and easily manufactured and installed, which will have a comparatively larger air heating capacity, and which will effect proper heating of the air for effective heating of a building in extremely cold weather.

A more specific object is to provide an improved hot air furnace construction includ ing a. novel and improved heat radiator in the upper end of the furnace casing and 'through which the smoke and products of combustion pass in flowing from the combustion chamber to the chimney or smoke flue of the building in which the furnace is installed, such heat radiator being arranged and constructed for effectively heating the air passing the same and supplied to the rooms of the'buil'ding. j 1

Other objects will appear as the nature of the invention is better understood, and the same consists in the novel form, combination and arrangement of parts hereinafter more fully described, shown in the accompanying drawings and claimed. i

In the drawings, wherein like reference characters indicate corresponding parts throughout the several views,

1 Figure 1 is a front elevational view of a hot air furnace constructed in accordance with the present invention;- v Figure 2 is a view thereof, in central vertical section;

Figure 3 1s a horizontal section taken sub stantially'upon line 3 3 of Figure 2; Figure 4 is a view similar to Figure 3 taken upon line H of Figure 2;

Figure 5 is a horizontal section taken upon line 5-5 of Figure 2; and

Figure 6 is a View similar to Figure 3 illustrating a modification of the invent-ion. Referring more in detail to the drawings, the present furnace embodies an outer shell or casing 5 preferably constructed of sheet metal and having a cold air inlet opening in the lower portion thereof adapted for connection with a cold air-supply pipe 6 in the usual way The furnace further includes an inner shell entirely spaced from and (11$- posed eoncentricaly Witllln the casmg 5;

the rising gases.

1926. Serial no. 121.176.

which shell is preferably formed of superimposed sections to facilitate manufacture and assen'ibly. This inner shell preferably consists of a lower cast metal section 7 having a supporting base or bottom Sand adapted to form the ash pit of the furnace, said section 7 being provided in its front side with a suitable opening closed by a door 9 and through which access may be had to the ash pit for removal of ashes, the door 9 being provided with suitable hinged "dampers 10 and 11 for facilitating control of the furnace draft. The inner shell'further consists of an intermediate section 12 adapted to form a fire box and placed upon the lower sect-ion 7, and an upper section 13 which tapers smaller in an upward direction and which is placed upon the intermediate section 12 to form the combustion chamber. The upper section 13 is formed with a front opening closed by a door 14 equipped with a damper 15 for facilitating supply of air to the combustion chamber for promoting combustion and insuring thorough burning of Supported at the top of the ash pit section 7 and substantially at the bottom of the fire pot 12 is asuitable grate section herein disclosed as comprising three llOI'lZOlltZtl sections 16, 17,16 arranged in side relation and mounted for rocking movement about parallel horizontal axes, the

outer sections 16 being of substantially semicircular form in plan as illustrated in Figure 5 and being in slightly spaced relation to accommodate the intermediate bar-like section 17 therebetween. Thesegrate sections are provided with individual forwardly projecting operating shafts 18 having polygonal forward end portions adapted to be engaged by a suitable operating crank handle for being rocked to effect shaking of ashes into the ash pit. The shafts 18 are coincident with the opening of door 9 closed bytheupper hinged damper 10 so that the grate-bar operating crank handle may be en- 1 gaged with the shafts 18 upon opening damper 10.. The inner shell is maintained in spaced concentric relation to the casing 5 by means of a plrl'ality of radial brackets .19

having their inner ends secured to the bot tom portion of the lower or ash pit section 7 and their outer ends secured to the lower portion of the casing'5 as shown.

Attacl ed to the innerside of the front ortion of casingfi directly above the'door 9 an open top receptacle or "waterpan 20 having an extension 21 at one end which projects forwardly through the front of the casing 5 and has a cover 22 adapted to be swung open or removed when it is desired to supply additional water to the pan 20, The pan is thus placed in the air space between the casing and the inner shell for moistening the air which is heated and supplied to the rooms of the building.

Disposed within the upper portion of the casing 5 is a heat radiator through which the smoke and products of combustion are adapted to pass in flowing from the upper end of the combustion chamber section 13 to the smoke flue or chimney, whereby the walls of the radiator are highly heated for insuring efiicient final heating of the rising air in the space between the casing 5 and the inner shell prior to supply of the same to the rooms of the building. This heat radiator embodies a cast member having a central smoke dome 23 rigidly connected to and arranged in spaced concentric relation to and within a horizontal ring-like smoke drum- 24, the dome 23 communicating through its rear side with the rear portion of the drum 24 as generally indicated at 25 in Figures 3 and 4, and the drum 24 having a smoke box 26 at its forward side which projects through the front of the casing 5 and has a front opening closed by a door 26 that may be opened for facilitating cleaning of soot from the drum. The rigid connection between the drum 24 and the dome 23 may consist of a bottom connecting web 27, and rigid with and depending from this web is an intake or tubular inlet 28 of flared form which seats at its lower edge upon the upper end of the combustion chamber section 13 and serves to lead the rising smoke and hot products of combustion into the dome23. As shown clearly in Figure 4 the drum 24 communicates with the lower portion of the smoke box 25, and the heat radiator further includes an upper horizontal smoke conduit 29, the forward portion of which communicates with the upper portion of the smoke box 25, and the rear portion of which projects through the rear side of the casing 5 as indicated at 30 for connection by a smoke pipe with the chimney or flue of the building. In the form of the invention shown inFigures 1 to 4 inclusive, the upper section or smoke conduit 29 of the heat radiator consists of a horizontal ring like drum slightly larger in diameter than the drum 24 and disposed directly above the latter as well as adjacent and beneath the top wall of the casing 5. This construction is preferred where a high degree of heat is necessary or desirable, as it is apparent that the rising air supplied to the casing 5 through the pipe 6 will be considerably heated when contacting and passing the upper radiator section 29 of this form.

As shown more clearly in Figure 4, the drum 24 is provided with a rearward extension 31. A loop heating pipe including upper horizontal portions arranged in the extension 31 and depending connected inner vertical portions 33 arranged within the combastion chamber section 13, is provided for facilitating production of hot water or steam when thefurnace is in use, one side of the coil or loop being adapted for suitable connection with a source of water supply, and the other side ofthe loop or coil being adapted to extend to the desired point of hot water or steam consumption. It will be seen that the depending inner vertical portion of the coil will be subjected to great heat within the combustion chamber for thoroughly heating the water passing through the coil, which water will be additionally heated in the upper horizontal iortion of the coil by reason of the latter being placed in the smoke conduit 24 and its extension 31.

In cases where extremely high heating of the air supplied to the rooms is not essential, the construction may be slightly modified as illustrated in Figure 6 wherein a straight horizontal upper smoke conduit 29 is provided in lieu of the upper drum conduit 29. In this instance the forward end of the conduit 29 is placed into communication with the upper portion of the smoke box 25, while the rear end of the conduit 29 projects through the rear of the casing 5 where it is adapted, as indicated at 30 for connection by a smoke pipe with the chimney or flue of the building. Otherwise, the construction of Figure 6 corresponds to that of the remaining figures.

In use, the rising smoke and hot roducts of combustion will pass into the ome 23, then into and through the side portions of drum 24 to smoke box 25, then upwardly into and through the drum or conduit 29 or 29, and then finally to and through the chimney or flue of the building. The air entering the space between the inner shell and the casing 5 from the cool air supply pipe 6, will rise and be heated due to the hot condition of the inner shell above the grate, such air being additionally and finally heated by contact with the heat radiator before finally passing out of the top of the casing for flowing to the rooms of the buildmg.

When the furnace is employed in onepipe heating systems, the top wall of the easing 5 will he provided with a relatively large central opening for the outlet of the heated air as illustrated in Figure 2, while, when the furnace is employed to supply the heated air to separate rooms through individual hot air supply pipes and registers, the upper portion of the casing 5 may be provided with the required number of outlet openings in communication with hot air conducting pipes. In View of the fact that these various adaptations of furnaces to specific types of heating systems are old and Well known in the art, it is believed that further illustration or description thereof will be unnecessary.

From the foregoing description it will be seen that I have provided a hotrair furnace of extremely simple and durable construction, and one Which may be cheaply and easily manufactured and installed for effecting the required heating of air for efficient heating of a building, even of considerable size. i t

Minor changes may be made Without departing from the spirit and scope of the invention as claimed.

Having thus described my invention, I claim 1. In a hot. air furnace, a casing, an inner shell spaced from the casing and forming an ash pit, a fire pot and a combustion chamber, means to facilitate supply of cold air into the bottom of the casing and the exit of hot air from the top of the casing about said shell, and a heat radiator in the top of the casing including a horizontal ringlike smoke conduit communicating with the top of the inner shell and adapted for connection with a chimney, an annular flange depending from the heat radiator and mounted on the upper edge of the Wall of the combustion chamber for supporting the radiator in position, said heat radiator further comprising a central smoke dome arranged concentrically Within the ring-like smoke conduit and communicating at its rear side with the rear portion of said smoke conduit, a forward smoke box for the conduit, and a superposed horizontal smoke conduit communicating at its forward side with the upper portion of the smoke box and adapted for connection at its rear side, said upper smoke conduit comprising a horizontal ringlike smoke drum of larger diameter than the first named smoke conduit and spaced there from vertically and concentrically to permit the flow of air to be heated thereover. V 2. A hot air furnace according to claim 1, in Which the combustion chamber smoke dome and concentric radiator drums are 10-, cated in concentric relation to the casing of the furnace.

In testimony whereof I afiix my signature.

GABRIEL HATVANI. 

